Corrosion [Visions] Kithkin Cleric and that opponent chooses target

and that opponent chooses target creature

"The best way to teach is by example

discard two cards

it gains haste

put a charge counter on Serum Tank

Corrosion [Visions] Kithkin Cleric and that opponent chooses targetSet: Visions Type: Enchantment Rarity: Rare Cost: {1}{B}{R} Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then destroy each artifact with mana value less than or equal to the number of rust counters on it. Artifacts destroyed this way